Since the releases of Drupal 7 and Joomla! 1.6, the community, the agencies and even the customers try to find out how to upgrade and whether it makes sense or not. In the case of Drupal the release of Drupal 7 means, that Drupal 5 is now at the end of its life. The Drupal community always provides the current and the previous version. In that case Drupal 6 and 7. Lullabot offers a how to on upgrading from Drupal 5 to 6. Not everyone is happy with the situation and Dries mentioned

.. if enough people wanted 5.x to be supported, and there are people in the community willing to provide that support, then something could be worked out, like an extra core maintainer that backports security patches.

In the Joomla! Community the same usual suspects try to figure out how to upgrade from 1.5 to 1.6. The procedure was a bit unclear because an additional component is needed and this component was written by one person and is still not 100% ready. Luckily, only the Joomla version 1.5 is out (1.0 is dead since 2009).

The next issues which are now explored seem to be templates (Joomla!) and performance (Drupal).

While the Drupal and Joomla! worlds still need to adjust to the latest releases, WordPress 3.1 is still a release candidate. What's up?

Using the momentum, the first Drupal print magazine is starting and will be given to the participants of DrupalCon Chicago (drupalwatchdog.com) - good luck! What's going on with drupalradar.com?

January is also the time to plan events for 2011. Here is a Europe centric list:

• Drupal
  • Jan 29-30 DrupalCamp Nates, France
  • Feb 4-6 Drupal Developer Days, Brussels, Belgium
  • Mar 7-10 DrupalCon Chicago, USA
  • Mar 12 Drupal Day Rostock, Germany
  • Mar 26 DrupalCamp, Lisbon, Portugal
  • Apr 8-9 Drupal Government Days, Brussels, Belgium
  • May 6-7 DrupalCamp Stockholm, Sweden
  • May 13-15 DrupalCamp Sevilla, Spain
  • May 14-15 DrupalCamp Berlin, Germany
  • May 26-27 Drupal Business Days, Helsinki, Finland
  • Aug 21-26 DrupalCon London, England
• Joomla!
  • Feb 4+5 Joomla! Night, Stockholm, Sweden
  • Apr 2+3 Joomla!Day, Doorn, Netherlands
  • Apr 2+3 Joomla!Day, Lyon, France
  • May 6-8 Jandbeyond, Kerkrade, Netherlands
  • Sep 3+4 Joomla!Day Deutschland, Hamburg, Germany
     
• WordPress
  • Found nothing in Europe so far

If you know more events, especially for WordPress, please give me a hint.

[update]

•  May 7, 1. WordCamp Brugg, Switzerland